Lap-board.



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JOSEPH PARK ROEHM, 0F PHILADELPHIA, PENNSYLVANIA.

LAP-BOARD.

Speccation of Letters Patent.

Patentedv May 31, 1910.

Application led March 18, 1910. Serial No. 550,117.

Myvinvention relates to lap-boards, andA has for its object the production of a board of this type from paper, which shall be acter, and cheap to manufacture.

As usually made, the lap-board is of wood, in dimensions about 7 by 25 inches, and among other things it is used for wrapping cloth, dress goods, linings, etc. in the mill for shipment.' "It has been proposed to make similar boards of paper, but so far as' I know without success, owing to too great flexibility, Weak edges, liability to warp, and quick deterioration from various causes. My present improvement is designed with a View to removing the ditliculties heretofore experienced in the use of paper for this purpose.

Brlely stated, it consists in forming a board with a cellular or ribbed formation running diagonally across the board, and in the best form with a double `thickness of the cellular formation folded so that the diagonals cross each other and smooth unbreakable edges are presented on both sides. The endsniay be protected in the same way by forming flaps, so that the exposed or cut portion of the structural material is all inturned. As an alternative, I may protect the ends in various ways as by folded pieces of metal, or b metal or wood stitlening rods inclosed within the paper ends.

My invention. is illustrated in the accompanying drawing in which- Fi boar embodying my invention, and Fig. 1a is an end view-thereof. Fig. 2 shows the same with metal end protectors. Fig. 3 is a view similar to- Fig. 1 with one Hap open and with portions broken away to show .the structure of the paper. Fig. 4 is a section on the line -of Fig. 3. Fig. 5 1s a face view of one end of a board with a stitfening rod.

Fig.`6 is an edge vview of the same. Fig. 7 is a similar view of an end formed with4 a ap, the corrugations running durable, non-warping in char.

re 1 is`a face view ofa completeV straight instead of diagonally. Fig. 8 is an ed e view of the same.'

' eferrin to the drawings, and especially Figs. 1 an whole, b being the back in one piece, b b2 the iaps foldedvover at b3 and 15*` to meet alon the line b intermediate of the edges l, B represents the board as a\ of t e board. -k The material employed is paper familiarly called corrugated or cellular and widel employed forpacking material and the ike. It consists essentially of twoor more strata or laminas with a corrugated intermediate layer glued to the layers on both sides of it, and inclosing continuous air spaces between its successive ribs or .corru ations. Such paper, or as it is sometimes cal ed, paper board, `is quite stiii", and will resist considerable pressure. Its strength is of course imparted to it by the arrangement of its congruent layers, the vwalls of the respective corrugations serving as transverse braces and stifeners, while the surface layers resist strains in their own planes. The benet of this bracing in several directions is lost, .however where the corrugations are parallel to the axis of a rotating or compound flexing strain. In other words, where the corrugatlons run length-wise or crosswise, the board will warp.

In the present case, as shown in Figs. 3 and 4, I cut the boarden the bias so that the corrugations'are oblique, and then fold it on the lines b3 and b, causing the flaps b and b2 to meet along one side intermediate of the edges, and preferably on a median line as shown. These flaps are glued down to the body or back b, and the whole board may be put in a press to dry, after which it is almost impossible lto twist it, and difficult to break it, as the corrugations act like cross veneers-making the product very tough.

.It will be observed in Fig.`1 that both the edges b3 and b4 are protected by being doubled over, and that raw or cut edges are exposed on the ends only. As the outside layers of this paper board are usually tough the liability to damage on the sides or edges is thus reduced to a minimum, and the ends as a rule are not subject to hard usage. However, they may be rotected in any one of several ways, one of) which is shown in Fig. 2, another in Figs. 5 and 6, and still another in Figs. 7 and 8.

In Fig. 2 a metal plate p is folded over the end and riveted through the board at against breakage, but also holds down the corners of the flaps b' and b2 insuring against their. starting and so loosening up the seam b. In Figs. 5 and 6, a rod z. is laid within a turned over flap be, and. in Figs. 7 and 8 the flap be is shown Without the rod but provided with the metal plate Which, however, may be omitted, as the folded end aords considerable protection by itself. It will be observed that in Fig. 5 the flap be is made pointed, and that the flaps b and b2 are cut to join when closed, sothat the edge all around iscontinuously protected.

I 'am aware that some changes and alterations may be made in nonessential details, such as the` shape of the article produced, and the protection of its ends, and I contemplate all such changes as fall fairly Within the scope of the appended claims. Thus for example, as shown in' Fig. 7, the ed e protection by folding the ap's b and 2 over each other is attained successfully even Where the corrugations run straight across or lengthwise of the board and the fla s instead of diagonally. The Hap b may be omitted and the aps and b2 extend clear to the end of the board along the line b5, and their exposed edges may be protected across the end by gluing or pasting a strip of cloth or other fabric thereover, as Well as across the edges of both flaps and extending longitudinally to cover the line b5.

Having thus described my 'invention What I claim and desire tosecure by Letters Patentv is- 1. A lap-board formed of' (paper laminae With-interior corru ations, sai corrugations extending diagona ly to the length of theY board, andl the material being folded so that the corrugations will crosseach other on opposite sides, substantially as described.

2. A lap-board formed of corrugated paper cut so that the corrugations will extend diagonally to the length of the board, and

p This not only serves to protect theend folded to form flaps meeting intermediate of the edges thereof, substantially as described.

3. A lap-board formed `of corrugated paper cut so that the 'corru ations Will -extend diagonally to the lengt of the board, folded to form flaps meetlng intermediate ofthe ed es, and having reinforcing means at the en s, substantially as described.

4. A lap board vformed of corru ated paper, folded on a line oblique to the irection of thecorrugations, with the flaps secured together so as to form a unitary structure with the corrugations crossin each other and having metal plates secure upon the opposite ends, substantially as described.

5. A lap board composed of lcorrugated paper, With side iiaps of equal dimensions folded together on lines diagonal to the corrugations and held in position by a suitable adhesive material, substantially as described.

6. A lap board composed of vcorrugated paper, having side flaps anden'd flaps folded on lines oblique to thedirection of the corrugations, and meetin at their edges so as to orm a smooth an 4continuous surface on both sides of the board, substantially as described.

. 7. A lap board composed of corrugated paper, havin end flaps folded over and secured upon t e body, and a sti'ening rod secured Within each end. flap along the folding line, substantially as describe 8. A lap board composed of paper having longitudinal aps folded over on arallel llnes so as to meet along an interme iate line on one side of the board, with means to secure said aps i-n position, and means to protect the exposed ends thereof.

In testimon whereof I affix my signature in presence o two Witnesses.

JOSEPH PARK ROEHM. 3 Vitnesses: I

I-InRvEY J. SHERER, HEPNER F. VAN HORN.

corrugated 

